In many-valued propositional logic systems, Let $\Gamma$ be a finite theory, there is a question that if $\Gamma$ is a consistency theory in $ n_{1}$-valued logic, is it consistent in $n_{2}$-valued logic? In this paper, we answer this question in following three prominent many-valued propositional logic systems.i.e. \L ukasiewicz many-valued propositional logic systems $L_{n}$, G\"{o}del many-valued propositional logic systems $G_{n}$, and the $R_{0}$-type many-valued propositional logic systems(NM logic) $\mathcal{L}^{*}_{n}$. The result shows that in different logic systems the conclusion is different.